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Pests and pest control in Oregon

Pests to know in Oregon

Why each one matters here is cited in the sections below.

Pests documented in Oregon

From public GBIF occurrence records since 1990. A record means a species was documented in Oregon, not that it's common near you.

Many public records (443)

Fewer public records (158)

Range named by extension sources (8)

Termites in Oregon

  • OSU Extension says Oregon's termites are subterranean termites rather than the drywood variety, and wood in contact with soil creates a pathway for them into a structure.[2]
  • According to OSU Extension, termite treatments for Oregon homes are often done only at the pre-construction phase.[2]

Invasive species reported here

  • After emerald ash borer was discovered in Oregon, the Oregon Department of Agriculture adopted a permanent quarantine limiting movement of ash, white fringe and olive tree material out of Washington, Yamhill, Marion, Clackamas and Multnomah counties.[3]
  • The brown marmorated stink bug, native to Asia, spread to Oregon in 2004 and is now well established across the state as a farm threat and household nuisance.[4]

Pests local experts flag

OSU Extension's list of common central Oregon spiders includes the hobo spider, giant house spider and the venomous black widow.[5]

Hiring a licensed company

Oregon's pesticide regulatory agency is the Oregon Department of Agriculture (Pesticide and Fertilizer Program).[1]

Licensing agency: Oregon Department of Agriculture — Pesticide and Fertilizer Program[1].

See also how to check a pest control license.

Free local help

  • The Oregon Department of Agriculture's Insect Pest Prevention and Management program offers insect identification through an online identification and invasive-pest reporting form.[6]
  • OSU Extension's Ask Extension service gives personalized answers from staff and volunteers, including on gardening, and aims to respond within three business days.[7]

Local guides in Oregon

Through the year

Fall
Brown marmorated stink bugs show up in Oregon homes in the fall.[4]

Sources

  1. National Pesticide Information Center, “State Pesticide Regulatory Agencies.” npic.orst.edu/reg/state_agencies.html (accessed 2026-10-06)
  2. Oregon State University Extension Service, “How can I prevent a termite infestation? | OSU Extension Service.” extension.oregonstate.edu/ask-extension/featured/how-can-i-prevent-termite-infestation (accessed 2026-10-06)
  3. Oregon Department of Agriculture, “ODA : Emerald Ash Borer : Current Projects : State of Oregon.” www.oregon.gov/oda/ippm/survey-treatment/Pages/emerald-ash-borer.aspx (accessed 2026-10-06)
  4. Oregon State University Extension Service, “Identifying brown marmorated stink bug | OSU Extension Service.” extension.oregonstate.edu/catalog/em-9054-identifying-brown-marmorated-stink-bug (accessed 2026-10-06)
  5. Oregon State University Extension Service, “Common Spiders Found in Central Oregon | OSU Extension Service.” extension.oregonstate.edu/collection/common-spiders-found-central-oregon (accessed 2026-10-06)
  6. Oregon Department of Agriculture, “ODA : Insect Pest Prevention and Management : Insect Pest Prevention and Management : State of Oregon.” www.oregon.gov/oda/ippm/pages/default.aspx (accessed 2026-10-06)
  7. Oregon State University Extension Service, “Have a Question? Ask Extension! | OSU Extension Service.” extension.oregonstate.edu/ask-extension (accessed 2026-10-06)

Updated 2026-10-06. Every statement on this page comes from the cited state, federal or university source. Spot an error? Tell us.